검색어: junctions (아랍어 - 영어)

* olav torheim, "elementary physics of p-n junctions", 2007.
* olav torheim, "elementary physics of p-n junctions", 2007.

the tight junctions of sertoli cells form the blood-testis barrier, a structure that partitions the interstitial blood compartment of the testis from the adluminal compartment of the seminiferous tubules.
* transferrin — a blood plasma protein for iron ion delivery===structural===the tight junctions of sertoli cells form the blood-testis barrier, a structure that partitions the interstitial blood compartment of the testis from the adluminal compartment of the seminiferous tubules.

because of the apical progression of the spermatogonia, the tight junctions must be dynamically reformed and broken to allow the immunoidentical spermatogonia to cross through the blood-testis barrier so they can become immunologically unique.
because of the apical progression of the spermatogonia, the tight junctions must be dynamically reformed and broken to allow the immunoidentical spermatogonia to cross through the blood-testis barrier so they can become immunologically unique.

أجسام السيارات ، وكذلك هياكل السيارات الأخرى مثل الأبواب والجزء الرئيسي من هياكل مقاعد السيارة ، يتم بناؤها من خلال تجميع العديد من المكونات. يتم تصنيع المكونات الأخيرة بشكل شائع عن طريق سحب الصفائح المعدنية بعمق. تُستخدم أيضًا عمليات أخرى ، مثل التشكيل الساخن للصفائح المعدنية ، أو العمليات الخاصة بالمواد المركبة. يتم استخدام مجموعة كبيرة من درجات الصلب ، معظمها ملفقة على شكل صفائح بسمك 0.8 إلى 1.5 مم ، بشكل شائع لهياكل السيارات. علاوة على ذلك ، من 1 إلى 3 مcar bodies, as well as other car structures such as the doors and the main part of the car seat structures, are built by assembling many components. the latter components are most commonly manufactured by deep drawing metal sheets. other processes, such as the hot forming of metal sheets, or processes specific to composite materials, are also used. a wide range of steel grades, mostly fabricated in the form of 0.8 to 1.5 mm thick sheets, are most commonly used for car-bodies. moreover, 1 to 3 mm thick aluminum alloy sheets are used for some lightweight cars. finally, other materials (such as magnesium alloy sheets or carbon-fiber reinforced polymer laminates) are used only in premium or sport models fabricated in very small numbers. joining processes are used both to fabricate the tailor welded blanks (twb), which are thereafter deep drawn to manufacture some parts, and to perform the final assembly. the two cases have different requirements. in the twb case, a continuous joining configuration is necessary, and butt joining is preferable over lap joining. moreover, the two parts can be accessed from all sides and easily clamped, allowing large forces to be used if necessary). finally, the plastic formability of the joint is of great importance. in the final assembly case, butt, lap and edge joints can all be used in principle, but lap and edge joints are generally preferred because they allow larger mounting tolerances. both linear (continuous) and pointwise (spot) junctions can be used. linear junctions are preferable from a mechanical point of view, but spot junctions are more widespread due to less stringent mounting tolerances, lower cost and simpler tooling and execution. moreover, during final assembly, access to the process zone is limited, giving an advantage to single-side processes, and the process forces must be low to avoid excessive deformation and complicated tooling. in the final assembly case, the plastic formability of the joint is unimportant. steel sheets are often zinc-coated before joining, whereas aluminum alloy sheets are generally not coated. resistance to atmospheric corrosion (after appropriate painting) is relevant for both twb and final assembly junctions. corrosion is much more critical for lap joints because they exhibit occluded interstices. fortunately,inthesteel-aluminummetalliccouples,galvaniccorrosionisnaturallyhindered by the aluminum passivation, and in principle it can be avoided if appropriate joining technologies and protective coatings are used.
car bodies, as well as other car structures such as the doors and the main part of the car seat structures, are built by assembling many components. the latter components are most commonly manufactured by deep drawing metal sheets. other processes, such as the hot forming of metal sheets, or processes specific to composite materials, are also used. a wide range of steel grades, mostly fabricated in the form of 0.8 to 1.5 mm thick sheets, are most commonly used for car bodies. moreover, 1 to 3 m